CID 2745687 (Synonyms: ML-194)

pIC50: 6.70 for human GPR35

CID-2745687 is a GPR35 antagonist. GPR35 is a poorly characterized member of the rhodopsinlike, class A subfamily of G protein-coupled receptors (GPCRs). GPCRs, based on the expression pattern, has been considered as a possible therapeutic target in conditions including diabetes, cardiovascular disease, as well as inflammation and pain.

In vitro: Previous study indicated that both CID-2745687 and ML-145 could competitively inhibit the effects of cromolyn disodium and zaprinast (two agonists sharing an overlapping binding site) on human GPR35. In contrast, though ML-145 antagonized the effects of pamoate competitively, CID-2745687 showed a noncompetitive fashion. Additionally, neither ML-145 nor CID-2745687 was able to antagonize the agonist effects at rodent ortholog of GPR35 [1].

In vivo: To test whether GPR35 contributes to the metabolic effect of Zaprinast, the retina from Cngb1/ mice was preincubated with a GPR35 antagonist, CID-2745687, followed by an additional Zaprinast treatment. Results showed that CID-2745687 did not block the effect of Zaprinast on glutamate and aspartate. Moreover, pamoic acid, the GPR35 agonist, did not change aspartate or glutamate levels [1].

Clinical trial: N/A

References:
[1] Jenkins L,Harries N,Lappin JE,MacKenzie AE,Neetoo-Isseljee Z,Southern C,McIver EG,Nicklin SA,Taylor DL,Milligan G.  Antagonists of GPR35 display high species ortholog selectivity and varying modes of action. J Pharmacol Exp Ther.2012 Dec;343(3):683-95.
[2] Du J,Cleghorn WM,Contreras L,Lindsay K,Rountree AM,Chertov AO,Turner SJ,Sahaboglu A,Linton J,Sadilek M,Satrústegui J,Sweet IR,Paquet-Durand F,Hurley JB.  Inhibition of mitochondrial pyruvate transport by zaprinast causes massive accumulation of aspartate at the expense of glutamate in the retina. J Biol Chem.2013 Dec 13;288(50):36129-40.